210.121.128.0/17

AS4766 · Korea Telecom

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Summary

Country	South Korea
Domain	kt.com
ASN	AS4766
Registry	KRNIC
ID	KORNET-KR

WHOIS Details

inetnum:        210.121.128.0 - 210.121.255.255
netname:        KORNET-KR
descr:          Korea Telecom
country:        KR
admin-c:        IA9-KR
tech-c:         IM9-KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
changed:        hostmaster@nic.or.kr 20240912
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC


person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        KT Head Office
country:        KR
phone:          +82-2-500-6630
e-mail:         kornet_ip@kt.com
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 20240912
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        KT Head Office
country:        KR
phone:          +82-2-500-6630
e-mail:         kornet_ip@kt.com
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 20240912
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC

Hosted domains

There are 236 domain names hosted across 87 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
210.121.210.44	internet-forensics.co.kr	110
210.121.176.12	ez-one.kr	11
210.121.197.5	hwacheon.co.kr	5
210.121.164.36	fz-indecoration.com	5
210.121.188.38	textbox.co.kr	4
210.121.176.122	amel.gq	4
210.121.148.100	kcredit.or.kr	4
210.121.187.179	won3d.site	3
210.121.151.145	latexian.com	3
210.121.238.5	environ2000.co.kr	3
210.121.210.28	mapinus.com	3
210.121.204.84	dajeong-tools.com	2
210.121.187.45	andami.co.kr	2
210.121.168.119	rrx-is.com	2
210.121.168.245	e-ilshin.com	2
210.121.143.213	inno-horn.com	2
210.121.164.126	livescherished.com	1
210.121.226.205	metalpen.me	1
210.121.243.11	wigobot.com	1
210.121.164.45	transformdesigning.com	1

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

Read more

Pingable IPs

9,420 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
210.121.245.126	AS4766 Korea Telecom	`2.61ms` from Seoul, KR
210.121.249.202	AS4766 Korea Telecom	`4.74ms` from Seoul, KR
210.121.235.122	AS4766 Korea Telecom	`1.79ms` from Seoul, KR
210.121.252.65	AS4766 Korea Telecom	`5.30ms` from Seoul, KR
210.121.238.253	AS4766 Korea Telecom	`1.47ms` from Seoul, KR
210.121.246.76	AS4766 Korea Telecom	`2.33ms` from Seoul, KR
210.121.234.68	AS4766 Korea Telecom	`1.28ms` from Seoul, KR
210.121.244.14	AS4766 Korea Telecom	`2.91ms` from Seoul, KR
210.121.242.251	AS4766 Korea Telecom	`2.42ms` from Seoul, KR
210.121.241.202	AS4766 Korea Telecom	`3.40ms` from Seoul, KR
210.121.253.81	AS4766 Korea Telecom	`3.92ms` from Seoul, KR
210.121.248.240	AS4766 Korea Telecom	`2.58ms` from Seoul, KR
210.121.250.23	AS4766 Korea Telecom	`4.33ms` from Seoul, KR
210.121.236.115	AS4766 Korea Telecom	`1.27ms` from Seoul, KR
210.121.233.120	AS4766 Korea Telecom	`1.64ms` from Seoul, KR
210.121.255.1	AS4766 Korea Telecom	`4.89ms` from Seoul, KR
210.121.240.69	AS4766 Korea Telecom	`4.44ms` from Seoul, KR
210.121.247.253	AS4766 Korea Telecom	`2.33ms` from Seoul, KR
210.121.237.8	AS4766 Korea Telecom	`1.13ms` from Seoul, KR
210.121.251.193	AS4766 Korea Telecom	`4.37ms` from Seoul, KR
210.121.243.129	AS4766 Korea Telecom	`2.66ms` from Seoul, KR
210.121.226.31	AS4766 Korea Telecom	`1.37ms` from Seoul, KR
210.121.163.40	AS4766 Korea Telecom	`1.25ms` from Seoul, KR
210.121.215.82	AS4766 Korea Telecom	`0.94ms` from Seoul, KR
210.121.134.251	AS55627 Dongduk Womens University	`2.27ms` from Seoul, KR

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
216.30.247.33	AS15227 LUMOS Networks, Inc.	`9.52ms` from Ashburn, US
123.183.224.1	AS4134 CHINANET-BACKBONE	`15.81ms` from Beijing, CN
117.8.154.17	AS4837 CHINA UNICOM China169 Backbone	`5.09ms` from Beijing, CN
77.11.5.193	AS6805 Telefonica Germany GmbH & Co.OHG	`2.39ms` from Berlin, DE
213.177.82.129	AS13226 CYBERNET SA	`1.37ms` from Brussels, BE
190.31.99.1	AS7303 Telecom Argentina S.A.	`1.73ms` from Buenos Aires, AR
190.192.133.1	AS7303 Telecom Argentina S.A.	`1.43ms` from Buenos Aires, AR
197.87.136.1	AS20011 Dimension Data	`2.12ms` from Cape Town, ZA
182.138.120.1	AS4134 CHINANET-BACKBONE	`1.89ms` from Chengdu, CN
98.4.229.65	AS11351 Charter Communications Inc	`17.25ms` from Chicago, US
18.224.31.113	AS16509 Amazon.com, Inc.	`8.27ms` from Chicago, US
71.29.20.1	AS7029 Windstream Communications LLC	`14.25ms` from Chicago, US
73.191.132.65	AS7922 Comcast Cable Communications, LLC	`11.81ms` from Chicago, US
186.137.107.1	AS7303 Telecom Argentina S.A.	`3.28ms` from Cordoba, AR
181.88.174.193	AS7303 Telecom Argentina S.A.	`0.49ms` from Cordoba, AR
131.255.160.65	AS264490 ANDRA TELECOM	`12.01ms` from Curitiba, BR
177.3.133.113	AS8167 V tal	`7.40ms` from Curitiba, BR
162.151.246.97	AS7922 Comcast Cable Communications, LLC	`1.16ms` from Denver, US
141.138.221.1	AS34612 Matrix DATA B.V.	`0.95ms` from Dronten, NL
79.220.117.65	AS3320 Deutsche Telekom AG	`4.38ms` from Duesseldorf, DE
120.82.188.1	AS17816 China Unicom IP network China169 Guangdong province	`3.77ms` from Guangzhou, CN
183.234.47.17	AS9808 China Mobile Communications Group Co., Ltd.	`5.83ms` from Guangzhou, CN
115.231.192.193	AS4134 CHINANET-BACKBONE	`5.57ms` from Hangzhou, CN
203.129.74.65	AS10032 BDX DC Services (HK) Limited	`1.76ms` from Hong Kong, HK
82.25.148.1	AS29802 HIVELOCITY, Inc.	`0.83ms` from Hong Kong, HK

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 210.121.143.175

traceroute to 210.121.143.175 (210.121.143.175): 64 hops max, 52 byte packets

1 [AS15169] 74.125.251.95 106.074 ms

2 *

3 [AS4766] 112.174.84.61 128.675 ms

4 *

5 *

6 [AS4766] 112.188.6.86 135.341 ms

7 [AS4766] 210.121.143.175 138.214 ms

Measurement taken from

IPinfo ProbeNet in Las Vegas, US

On September 4th 2025

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

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